cycle renderer with multiple textures on single mesh
You have quite a few problems here, you should probably watch some basic cycles material tutorials. You appear to have misread some stuff about alpha blending, it is not how you would achieve what you are trying to do.

The way to do this would be to assign one material to the shirt (using the shirt texture) and a whole different material to the skin. As they are separate meshes this should be fairly easily.

Another problem I have noticed is that you are plugging colour data (the yellow node connections) into shader data (the green ones). While cycles will try and make sense of this, generally if you are plugging connections between different coloured sockets, then something isn't quite right. In this case you want the put a shader node (Like a diffuse BSDF) in between the texture and the mix shader or output(if you get rid of the mix shader).